It uses my own 3D animation engine. It utilizes not-so reliable but powerful features of the Flash Player. You'll need version 11.2.

====== IMPORTANT ======
There's a chance that you won't be able to start the animation at all. There's a YouTube link below the title for this reason. Also, make sure to choose appropriate quality (old/good/modern hardware). If you find the animation ridiculously slow, restart it on lower quality or rather watch it on YouTube.